Ooh GeorgeOliver, good luck to you

we are in the same position, DS is nearly 7 and things have picked up a lot recently. As we are up North we have to miss some school for castings, so we have to be really picky on which castings to accept but also make sure our agent asks for slots after 5.30 as well. This means we can get our afternoon attendance tick tho we will have to leave earlier.
I would def go and see your headteacher face to face and ask how/what is the best way to manage the absences so show you care for them as well and want to work alongside. My DS has just done a 5 day shoot in Italy, 3 school days,2 non school. His teacher gave him 12 sheets of maths works and reading books to complete. I now need to go in tomorrow to ask for another day off next week for a photo shoot and one the following for a short film

I have been speaking to our LEA lady to check that school are ticking the right boxes and wont be penalised but I am afraid the news is not good

Even with a licence, whether the abscence is marked as H (Holiday absence where the head can currently authorise up to 10 days but will then restrict) or C (other authorised circumstances) it will still impact on the School Absence record
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What is more annoying is that there is also a code "Approved Sporting activity" which doesnt affect the schools absence rate at all! Apparently only the D of E can make the codes, maybe we need to start (another) petition for acting/modelling one i think
Sorry to post not so good news, I am in exactly the same position, but I hope forewarned with the facts is forearmed. Good Luck !